• CN：11-2187/TH
  • ISSN：0577-6686
机械工程学报

›› 1995, Vol. 31 ›› Issue (6): 97-101.

• 论文 • 上一篇    下一篇

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Pr激光表面合金化对Ti-6Al-4V组织热稳定性的影响

车成卫;张志明;田锡唐   

  1. 北京科技大学;哈尔滨工业大学
  • 发布日期:1995-11-01

INFLUENCE OF LASER SURFACE ALLOYING WITH Pr ON THE THERMAL STABILITY OF Ti-6Al-4V

Che Chengwei;Zhang Zhiming;Tian Xitang   

  1. Beijing University of Science and Technology Harbin Institute of Technology
  • Published:1995-11-01

摘要： 采用激光Pr合金化处理，研究了Ti-6Al-4V稀土合金化快速凝固组织对热稳定性的影响。结果表明，Ti-6Al-4V激光表面Pr合金化可提高其在700℃以下的热稳定性，这是由于快速凝固过程获得的组织在高温下具有良好的抗粗化能力。TEM分析表明，经Pr合金化的钛合金表层内形成一种含Pr的有序固溶体相，该相具有六方结构，a＝0.3914nm，c＝0.6592nm，c/a＝1.684，呈椭圆或圆形颗粒状，分布于初生β柱晶的亚胞胞壁，尺寸约0.1～0.4μm。在退火过程中还形成一种析出相，分布于位错线及小角晶界上，尺寸为10～20nm，分析了这两种析出相对组织热稳定性的积极作用。

关键词: 激光合金化, 热稳定性, 钛合金

Abstract: The thermal stability of rapidly solidified (RS) structures obtained in laser surface alloying on Ti-6Al-4 V with Pr is studied. The results show that the addition of Pr by laser can significantly increase the thermal stability of Ti-6Al-4 V below 800℃. It is due to the good resistance of RS structures to grain coarsening. TEM analysis indicates that 0.1-0, 4μm dispersed particles of the ordered phases containing Pr formed in the alloyed zone have the hexagonal close packed structure with a = 0.3914nm, c = 0.6592nm, c / a =1.684, and they are distributed in the interface of subcell in the primary columnar grains. During subsequent vacuum annealing, much finer precipitates of 10～20nm form on the dislocation lines and low angle boundaries. They are both beneficial to improving the thermal stability.

Key words: Laser allaying, Thermal stability, Ti-alloy

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